Fics like Guardian of My Heart

In an alternate universe where Iruma is half demon, half human. His terrible "parents" aren't his true family, and neither of his true human or demon parents are known to him. Surviving in the human realm as a creature that shouldn't exist, Iruma struggles against the pain and anguish of his life day after day. But when his darkest hour approaches, a familiar presence comes to his aid. He will struggle to adapt to the Netherworld and its demonic nature, as well as survive the internal struggle within himself. Can he move on from the pain of his past and look towards a brighter future, or will he slip into the depths of despair the likes of which none have faced before? (Or: Iruma is Opera's biological son, and he is rescued from the human realm by Demon Border Control and brought to the Netherworld. He has trouble fitting in with his fellow demons at first, but slowly things look like they're getting better. Stress over keeping his hybrid nature a secret begins to build, and he struggles to control his bloodline magic without letting it control him.)

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  1. Grounding by RoseberryGreen (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime))
  2. Found Treasure by Rose_Bookworm (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime), more)
  3. Authority of the Demon King by Alittlwweirdo (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime), more)
  4. Grounded by FollowtheLeider (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga))
  5. Curses by Sleepycoffeeaddict13 (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime))
  6. A Hero in a Demon school!!!! by Greyninja27 (僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia, 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), more)
  7. liberation of the damned. by %E3%83%AA%E3%83%AA%E3%82%B9%20-%20riris (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime))
  8. pawprints by thewunderkind (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga))
  9. Flightless boy by Alittlwweirdo (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime), more)
  10. Still A Survivor by Thornrose270 (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun - All Media Types, 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), more)
  11. Bablys' Baby by ChaoticCelestialCreation (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime), more)
  12. A New Start: The Beginning of a Beautiful Life! by SleepyLilacFox (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime))
  13. Chrysalis and the Purple Witch by ChaoticCelestialCreation (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime))
  14. Welcome to Demon School, Izuku-Kun! (On Hiatus) by 616mcu, HAZZARD_OVERFLOW (僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia, 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), more)
  15. The Netherworld's hidden gem by katexZ (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga))
  16. The Guard Puppy of Babyls: Prelude by sasan00 (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime))
  17. A missing piece for a puzzle by Barbeque11 (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime))
  18. One helluva time with Iruma kun by 616mcu, HAZZARD_OVERFLOW (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), Hazbin Hotel (Cartoon), more)
  19. The Ground We Walk On. by GarnetJPH (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime))
  20. Call of Silence by FlorQuinnUwU (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga))